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| I've been thinking about having foam insulation blown into the spaces between the rafters in my attic.
The attic floor is insulated with cellulose, and the attic is open to the outside with a couple of whirly-gigs and two gable vents. Would insulating the rafters give me any benefit at all? |
Follow-Up Postings:
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| Hi, No, if the space above the current insulation is ventilated to the outside, then you won't get much of any benefit out of insulating the roof rafters. It would be better just to add more insulation on top of the current insulation. Blown in cellulose works well and is cheap and easy to do. Gary |
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- Posted by energy_rater_la (My Page) on Mon, May 19, 08 at 16:41
| search www.buildingscience.com for info on unvented attics lots of foam insulation companies sell a 'total enapsulated' attic package. best of luck. |
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- Posted by garymunson-2008 (My Page) on Wed, Jun 11, 08 at 21:09
| foam....a good way to rot your roof deck and trusses |
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- Posted by happycthulhu (My Page) on Thu, Jun 12, 08 at 10:58
| Ok, well I guess that's nixed that idea. How about insulating under my wood floors in the crawl space? |
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- Posted by rjoh878646 (My Page) on Tue, Jun 17, 08 at 12:30
| You would need closed cell foam sprayed in your crawlspace. |
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| Can't tell where you are located from the pics of your house, but if your concern is summertime heat gain you might consider radiant barrier installed on your rafters. It will help considerably in the summer. But to have any positive impact in the winter it needs to be installed right over the existing insulation and it looks like a large section of your attic is floored and you use it for storage. You can google radiant barrier and find plenty of sites that show how to install. It should be a pretty easy diy project in that attic, g'luck |
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- Posted by lindamarie (My Page) on Fri, Aug 22, 08 at 14:02
| You do not say where you are or if you have heat/AC ducts in your attic. You can use styrofoam panels with a foil heat barrier installed on your rafters. Those whirly-gigs are useless. I had mine removed when we put on the new roof. The conditioned crawl space is a great idea. Close your vents off. |
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- Posted by happycthulhu (My Page) on Fri, Aug 22, 08 at 14:17
| Our ducts are in the crawl space. I can't close off my crawl space though because my house is balloon framed. I can look up from inside the crawlspace all the way into the attic because of the space between the outside brick and the wood frame for the interior. The cold air would just flow up into the attic and out the vents. As for whirly-gigs, ours work real well. We have two of them plus gable vents and it's cooler up there than it was before we had the whirly-gigs installed. I wonder if styrofoam panels with foil would be a good idea for between the floor joists in the crawl space? |
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- Posted by CTFoamInsulation (My Page) on Sun, Feb 10, 13 at 9:16
| Hi Happycthulhu. Yes! Spray foam insulation would do a tremendous job for your application(s). I provided a link below that has good information for anyone interested. Thanks, Mike |
Here is a link that might be useful: Spray Foam Insulation
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| Spammers dig up old threads. There is lots of bad information in this thread. Nothing good can come without climate/location information. |
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